Motor and drum washing machine having the same

Abstract

Disclosed are a motor and a drum washing machine having the same. The motor includes external stators and internal stators, which are respectively disposed in a ring shape and are separated from each other in a radial direction, and rotors, which are disposed in a ring shape and are rotatably installed between the external stators and the internal stators such that the rotors are rotated due to interaction with the external stators and the internal stators, thus being capable of generating a high rotary force while maintaining a uniform length in an axial direction.

1. A motor comprising:
 a stator unit including external stators and internal stators, which are respectively disposed in a ring shape and which are separated from each other in a radial direction; and 
 a rotor unit including rotors, which are disposed in a ring shape and which are rotatably installed between the external stators and the internal stators, 
 wherein the external stators and the internal stators are coils obtained by winding a wire, and wherein the rotors are permanent magnets; 
 wherein the stator unit further includes an external bobbin having a ring shape and provided with a plurality of external teeth extended from the inner circumferential surface thereof to form the coils of the external stators, and an internal bobbin having a ring shape and provided with a plurality of internal teeth extended from the outer circumferential surface thereof to form the coils of the internal stators; and 
 wherein the stator unit further includes a support frame having a ring shape and provided with an external support rib formed at the outer circumferential surface thereof to support the outer circumferential surface of the external bobbin and an internal support rib formed at the inner circumferential surface thereof to support the inner circumferential surface of the internal bobbin, and a stator fixing member formed by insert injection molding to fix the external stators and the internal stators under the condition that the external stators and the internal stators are installed on the support frame. 
 
     
     
       2. The motor according to  claim 1 , wherein the rotor unit further includes a hub plate having a disk shape and provided with a shaft installation part formed through the central portion thereof, in which a rotary shaft is installed, and a rotor fixing member formed by insert injection molding to fix the rotors to the outer circumferential surface of the hub plate under the condition that the rotors are disposed in the ring shape. 
     
     
       3. The motor according to  claim 1 , wherein the external bobbin is formed by stacking a plurality of external bobbin plates, each of which is a metal plate having a ring shape, provided with the plurality of external teeth extended from the inner circumferential surfaces thereof. 
     
     
       4. The motor according to  claim 3 , wherein each of the plurality of external bobbin plates is formed by connecting a plurality of external divided plates, each of which has an arc shape. 
     
     
       5. The motor according to  claim 4 , wherein an external fixing protrusion is formed on one end of each of the plurality of external divided plates so as to be fixed to the other end of the neighboring one of the plurality of external divided plates, and an external fixing groove is formed in the other end of each of the plurality of external divided plates so as to be fixed to one end of the neighboring one of the plurality of external divided plates. 
     
     
       6. The motor according to  claim 5 , wherein each of the plurality of external divided plates is formed by bending an external metal plate having a designated length and width and provided with the plurality of external teeth extended from one surface thereof in a width direction, and a plurality of external bending grooves, which allow the external metal plate to be easily bent, are depressed in one surface of the external metal plate in the width direction. 
     
     
       7. The motor according to  claim 1 , wherein the internal bobbin is formed by stacking a plurality of internal bobbin plates, each of which is a metal plate having a ring shape, provided with the plurality of internal teeth extended from the outer circumferential surfaces thereof. 
     
     
       8. The motor according to  claim 7 , wherein each of the plurality of internal bobbin plates is formed by connecting a plurality of internal divided plates, each of which has an arc shape. 
     
     
       9. The motor according to  claim 8 , wherein an internal fixing protrusion is formed on one end of each of the plurality of internal divided plates so as to be fixed to the other end of the neighboring one of the plurality of internal divided plates, and an internal fixing groove is formed in the other end of each of the plurality of internal divided plates so as to be fixed to one end of the neighboring one of the plurality of internal divided plates. 
     
     
       10. The motor according to  claim 9 , wherein each of the plurality of internal divided plates is formed by bending an internal metal plate having a designated length and width and provided with the plurality of internal teeth extended from one surface thereof in a width direction, and a plurality of internal bending grooves, which allow the internal metal plate to be easily bent, are depressed in the other surface of the internal metal plate in the width direction. 
     
     
       11. A drum washing machine comprising a tub containing washing water, a drum rotatably installed in the tub, and a motor installed on the rear surface of the tub to rotate the drum, wherein a motor includes:
 a stator unit including external stators and internal stators, which are respectively disposed in a ring shape and which are separated from each other in a radial direction; and 
 a rotor unit including rotors, which are disposed in a ring shape and which are rotatably installed between the external stators and the internal stators, 
 wherein the external stators and the internal stators are coils obtained by winding a wire, and wherein the rotors are permanent magnets; 
 wherein the stator unit further includes an external bobbin having a ring shape and provided with a plurality of external teeth extended from the inner circumferential surface thereof to form the coils of the external stators, and an internal bobbin having a ring shape and provided with a plurality of internal teeth extended from the outer circumferential surface thereof to form the coils of the internal stators; and 
 wherein the stator unit further includes a support frame having a ring shape and provided with an external support rib formed at the outer circumferential surface thereof to support the outer circumferential surface of the external bobbin and an internal support rib formed at the inner circumferential surface thereof to support the inner circumferential surface of the internal bobbin, and a stator fixing member formed by insert injection molding to fix the external stators and the internal stators under the condition that the external stators and the internal stators are installed on the support frame. 
 
     
     
       12. The drum washing machine according to  claim 11 , wherein the rotor unit further includes a hub plate having a disk shape and provided with a shaft installation part formed through the central portion thereof, in which a rotary shaft is installed, and a rotor fixing member formed by insert injection molding to fix the rotors to the outer circumferential surface of the hub plate under the condition that the rotors are disposed in the ring shape. 
     
     
       13. The drum washing machine according to  claim 11 , wherein the external bobbin is formed by stacking a plurality of external bobbin plates, each of which is a metal plate having a ring shape, provided with the plurality of external teeth extended from the inner circumferential surfaces thereof. 
     
     
       14. The drum washing machine according to  claim 13 , wherein each of the plurality of external bobbin plates is formed by connecting a plurality of external divided plates, each of which has an arc shape. 
     
     
       15. The drum washing machine according to  claim 14 , wherein an external fixing protrusion is formed on one end of each of the plurality of external divided plates so as to be fixed to the other end of the neighboring one of the plurality of external divided plates, and an external fixing groove is formed in the other end of each of the plurality of external divided plates so as to be fixed to one end of the neighboring one of the plurality of external divided plates. 
     
     
       16. The drum washing machine according to  claim 15 , wherein each of the plurality of external divided plates is formed by bending an external metal plate having a designated length and width and provided with the plurality of external teeth extended from one surface thereof in a width direction, and a plurality of external bending grooves, which allow the external metal plate to be easily bent, are depressed in one surface of the external metal plate in the width direction. 
     
     
       17. The drum washing machine according to  claim 11 , wherein the internal bobbin is formed by stacking a plurality of internal bobbin plates, each of which is a metal plate having a ring shape, provided with the plurality of internal teeth extended from the outer circumferential surfaces thereof. 
     
     
       18. The drum washing machine according to  claim 17 , wherein each of the plurality of internal bobbin plates is formed by connecting a plurality of internal divided plates, each of which has an arc shape. 
     
     
       19. The drum washing machine according to  claim 18 , wherein an internal fixing protrusion is formed on one end of each of the plurality of internal divided plates so as to be fixed to the other end of the neighboring one of the plurality of internal divided plates, and an internal fixing groove is formed in the other end of each of the plurality of internal divided plates so as to be fixed to one end of the neighboring one of the plurality of internal divided plates. 
     
     
       20. The drum washing machine according to  claim 19 , wherein each of the plurality of internal divided plates is formed by bending an internal metal plate having a designated length and width and provided with the plurality of internal teeth extended from one surface thereof in a width direction, and a plurality of internal bending grooves, which allow the internal metal plate to be easily bent, are depressed in the other surface of the internal metal plate in the width direction.